# $FreeBSD: releng/12.1/bin/sh/tests/builtins/case10.0 223546 2011-06-25 20:37:43Z jilles $
# $BSDSUniX $

case ! in
[\!!]) ;;
*) echo Failed at $LINENO ;;
esac

case ! in
['!'!]) ;;
*) echo Failed at $LINENO ;;
esac

case ! in
["!"!]) ;;
*) echo Failed at $LINENO ;;
esac